[PATCH v2 09/11] clk: mvebu: cp110: add sdio clock to cp-110 system controller
From: Gregory CLEMENT <hidden>
Date: 2017-05-31 13:42:13
Also in:
linux-clk, linux-devicetree, lkml
Subsystem:
arm/marvell kirkwood and armada 370, 375, 38x, 39x, xp, 3700, 7k/8k, cn9130 soc support, common clk framework, the rest · Maintainers:
Andrew Lunn, Gregory Clement, Sebastian Hesselbarth, Michael Turquette, Stephen Boyd, Linus Torvalds
From: Konstantin Porotchkin <redacted> This commit updates the CP110 system controller driver to add the definition for a missing clock. The SDIO clock is dedicated driving the SDHCI interface and its frequency is 400MHz (2/5 of PLL source clock). The SDIO interface should be bound to this clock and not the core clock as in the older code. Using the wrong clock lead to a maximum SDHCI frequency of 250 Mhz, while the HW really supports up to 400 Mhz. This patch also fixes the NAND clock relationship documentation. Signed-off-by: Konstantin Porotchkin <redacted> [gregory.clement at free-electrons.com: - use sdio instead of emmc to name the clock] Reviewed-by: Thomas Petazzoni <redacted> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Gregory CLEMENT <redacted> --- drivers/clk/mvebu/cp110-system-controller.c | 28 ++++++++++++++++++---- 1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/clk/mvebu/cp110-system-controller.c b/drivers/clk/mvebu/cp110-system-controller.c
index ecbcae321424..8be7ae25c7eb 100644
--- a/drivers/clk/mvebu/cp110-system-controller.c
+++ b/drivers/clk/mvebu/cp110-system-controller.c@@ -11,15 +11,16 @@ */ /* - * CP110 has 5 core clocks: + * CP110 has 6 core clocks: * * - APLL (1 Ghz) * - PPv2 core (1/3 APLL) * - EIP (1/2 APLL) - * - Core (1/2 EIP) + * - Core (1/2 EIP) + * - SDIO (2/5 APLL) * * - NAND clock, which is either: - * - Equal to the core clock + * - Equal to SDIO clock * - 2/5 APLL * * CP110 has 32 gatable clocks, for the various peripherals in the
@@ -46,7 +47,7 @@ enum { CP110_CLK_TYPE_GATABLE, }; -#define CP110_MAX_CORE_CLOCKS 5 +#define CP110_MAX_CORE_CLOCKS 6 #define CP110_MAX_GATABLE_CLOCKS 32 #define CP110_CLK_NUM \
@@ -57,6 +58,7 @@ enum { #define CP110_CORE_EIP 2 #define CP110_CORE_CORE 3 #define CP110_CORE_NAND 4 +#define CP110_CORE_SDIO 5 /* A number of gatable clocks need special handling */ #define CP110_GATE_AUDIO 0
@@ -235,7 +237,8 @@ static int cp110_syscon_common_probe(struct platform_device *pdev, struct regmap *regmap; struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; - const char *ppv2_name, *apll_name, *core_name, *eip_name, *nand_name; + const char *ppv2_name, *apll_name, *core_name, *eip_name, *nand_name, + *sdio_name; struct clk_hw_onecell_data *cp110_clk_data; struct clk_hw *hw, **cp110_clks; u32 nand_clk_ctrl;
@@ -315,6 +318,17 @@ static int cp110_syscon_common_probe(struct platform_device *pdev, cp110_clks[CP110_CORE_NAND] = hw; + /* SDIO clock is APLL/2.5 */ + sdio_name = cp110_unique_name(dev, syscon_node, "sdio-core"); + hw = clk_hw_register_fixed_factor(NULL, sdio_name, + apll_name, 0, 2, 5); + if (IS_ERR(hw)) { + ret = PTR_ERR(hw); + goto fail_sdio; + } + + cp110_clks[CP110_CORE_SDIO] = hw; + /* create the unique name for all the gate clocks */ for (i = 0; i < ARRAY_SIZE(gate_base_names); i++) gate_name[i] = cp110_unique_name(dev, syscon_node,
@@ -344,6 +358,8 @@ static int cp110_syscon_common_probe(struct platform_device *pdev, parent = ppv2_name; break; case CP110_GATE_SDIO: + parent = sdio_name; + break; case CP110_GATE_GOP_DP: parent = gate_name[CP110_GATE_GOP]; break;
@@ -391,6 +407,8 @@ static int cp110_syscon_common_probe(struct platform_device *pdev, cp110_unregister_gate(hw); } + clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_SDIO]); +fail_sdio: clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_NAND]); fail_nand: clk_hw_unregister_fixed_factor(cp110_clks[CP110_CORE_CORE]);
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